CN102403531A - High rate lithium iron phosphate cell and preparation method thereof - Google Patents
High rate lithium iron phosphate cell and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high rate lithium iron phosphate cell and a preparation method thereof. The method comprises steps of preparation of an anode slurry and a cathode slurry, design of an anode sheet and a cathode sheet and design of cell safety, and aims to improve rate performance of a lithium iron phosphate cell and enhance cell safety. The preparation of the anode slurry and the cathode slurry employs a method combining ultrasonic mixing and mechanical stirring to enhance slurry disperse effect. The anode is prepared by pulping a lithium iron phosphate active material, a conductive agent and a binder according to a certain ratio and coating on an aluminium foil. The cathode is prepared by pulping graphite (or intermediate phase carbon microballoon), a conductive agent and butadiene styrene rubber (SBR) according to a certain ratio and coating on a copper foil. The anode and the cathode are prepared into a cylinder cell; an electrical core is assembled under an atmosphere protection environment; and a cap deflation apparatus is used to enhance safety of the cell. The lithium ion cell of the invention has good safety and can realize high rate 30 C continuous discharge.
Description
Technical field
The invention belongs to the technical field of lithium ion battery, particularly relate to a kind of high magnification ferric phosphate lithium cell and preparation method thereof.
Background technology
Development new material, exploitation renewable energy technologies become one of key subjects that the 21 century mankind will solve.And be the important means of effective use of energy sources as the chemical power source of energy storage and reforming unit.At present, lithium ion battery, fuel cell are the research focuses of field of chemical power source, especially as electrokinetic cell environmental protection and social development are had great importance.Lithium ion battery is because of its operating voltage is high, energy density is big, self-discharge rate is low, advantages of environment protection receives countries in the world extensive concern.
Use more have cobalt acid lithium battery, ternary material battery, lithium manganate battery, ferric phosphate lithium cell in the market.Wherein, no matter ferric phosphate lithium cell comprises reversible capacity, stability, fail safe, cyclicity and large current discharging capability from chemical property, and still raw-material price all is superior to other types battery.Especially cycle performance, 2000 capability retentions of energy type ferric phosphate lithium cell 1C circulation can reach more than 80%, far above cobalt acid lithium battery, ternary material battery, lithium manganate battery.Because new-energy automobile; Electric bicycle; Electric tool etc., very high to the lithium ion battery requirement, must have the performance of high-energy-density, high-specific-power, quick charge and deep discharge; And require that cost is low as far as possible, useful life is long as far as possible, therefore selecting ferric phosphate lithium cell for use is comparatively ideal power lithium-ion battery.For solving the high-multiplying power discharge and the fail safe of lithium ion battery, utilize the good characteristics of LiFePO4 fail safe, developed a kind of high magnification ferric phosphate lithium cell.
Summary of the invention
The purpose of this invention is to provide a kind of high magnification ferric phosphate lithium cell and preparation method thereof, solve the high-multiplying power discharge difference of common lithium ion battery and the problem of poor stability, further enlarge the application of lithium ion battery.
The present invention realizes through following technical scheme:
A kind of high magnification ferric phosphate lithium cell comprises positive pole and negative pole, and positive pole is that LiFePO4 active material, conductive agent and binding agent are coated on the aluminium foil after according to proportioning slurrying; Negative pole is that graphite, conductive agent and binding agent are coated on the Copper Foil according to proportioning slurrying; Process column type box hat battery, it is characterized in that: the specific area＜30m of LiFePO 4 material in the anode sizing agent
2/ g, conductive agent are that conductive black (Super P-Li) or KS series, SFG are serial, CNT, carbon nano-fiber, and binding agent is Kynoar (PVDF) series, and its weight proportion is: active compound lithium iron phosphate 70 ~ 93%; Conductive agent is 1 ~ 20%; Binding agent is 2 ~ 15%; The cathode size proportioning is: active material graphite or carbonaceous mesophase spherules or lithium titanate 85 ~ 95%, conductive agent are that conductive black (Super P-Li) or KS series, SFG are serial, CNT, carbon nano-fiber, and the conductive agent percentage by weight is: 1 ~ 10%; Binding agent is butadiene-styrene rubber (SBR), and weight of binder percentage is 2 ~ 8%; It is to combine with ultrasonic agitation and mechanical agitation to improve the slurry degree of scatter that the preparation of affiliated anode sizing agent and cathode size is adopted; The electricity core assembles under the atmosphere protection environment, and the block of battery is provided with air releasing device.
According to described a kind of high magnification ferric phosphate lithium cell; It is characterized in that: stir and adopt mechanical agitation that slurry is carried out the pre-dispersed 1 ~ 6h of high speed earlier, adopt ultrasonic agitation and mechanical agitation to combine again pre-dispersed slurry is further disperseed, improve the even degree of scatter of material; Ultrasonic agitation is 1 ~ 6h; Ultrasonic pressure is 5 ~ 20MPa, supersonic frequency 15 ~ 60KHz, and mixing speed is 120 ~ 2200r/min.
According to described a kind of high magnification ferric phosphate lithium cell, it is characterized in that: described positive/negative plate lug adopts multipole ear mode, lug number >=2.
According to described a kind of high magnification ferric phosphate lithium cell, it is characterized in that: described aluminum foil thickness is 15 ~ 25 μ m, and copper thickness is 10 ~ 20 μ m; Positive pole ear is an aluminium strip, and width is between 3 ~ 25mm; Negative lug is nickel strap or copper nickel composite band, and width is 3 ~ 25 μ m.
According to described a kind of high magnification ferric phosphate lithium cell, it is characterized in that: the protective atmosphere when electric core assembles is nitrogen or argon gas, and the popping pressure of block is 1.0 ~ 5.0MPa.
According to described a kind of high magnification ferric phosphate lithium cell, it is characterized in that: battery diaphragm is three layers of composite diaphragm of PP/PE/PP or PE single-layer septum, and the thickness of barrier film is 15 ~ 30 μ m; Electrolyte is lithium hexafluoro phosphate (LiPF
6) with ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate organic solution in two or more mixture.
A kind of method of high magnification ferric phosphate lithium cell is characterized in that: it is the method that combines with ultrasonic agitation and mechanical agitation that the preparation of positive and negative electrode slurry is adopted, and has improved the slurry dispersion effect; Positive pole is that LiFePO4 active material, conductive agent and binding agent are coated on the aluminium foil after according to said proportioning slurrying; Negative pole is that graphite or carbonaceous mesophase spherules, lithium titanate, conductive agent and butadiene-styrene rubber (SBR) are coated on the Copper Foil according to said proportioning slurrying; Process column type box hat battery, electric core assembles under the atmosphere protection environment, and battery improves its fail safe through the block air releasing device.
Preparation method according to described high magnification ferric phosphate lithium cell is characterized in that:
Preparation is anodal: active material is that specific area is 25m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6 is an electrically conductive graphite, and binding agent is Kynoar PVDF5130, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas; The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=89:4:2:5:115; At first PVDF5130 is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, the mechanical high-speed stirring was carried out pre-dispersed in 3 hours, mixing speed 1800r/min; Adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir then 3 hours, mechanical high-speed mixing speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Slurry is coated with through after the froth in vacuum, and using the thickness of aluminium foil is 20 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 4, and width is the aluminium strip of 5mm;
The preparation negative pole: negative electrode active material is artificial graphite C AG-3, and conductive agent is conductive black Super-P, and adhesive is butadiene-styrene rubber (SBR), and thickener is sodium carboxymethylcellulose (CMC), and water is solvent, and the negative pole viscosity Control is 1500 ~ 6000mPas; The ratio of various materials is in the slurry: CAG-3:Super-P:CMC:SBR:H
2O=91:4:1.5:3.5:125; At first that CMC is soluble in water; Add mixed in advance Delanium and conductive agent, high-speed stirred 3 hours, mixing speed 1800r/min again; And then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir 2 hours; High-speed stirred speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Added the SBR high-speed stirred again 2 hours, mixing speed 1500r/min; Slurry is coated with through after the froth in vacuum, and using the thickness of Copper Foil is 15 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 3, and width is the ambrose alloy composite band of 5mm;
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 30h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling; Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 6g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m; Employing has the block of air releasing device, and popping pressure is 1.8 ~ 2.3MPa.
Preparation method according to described high magnification ferric phosphate lithium cell is characterized in that:
Preparation is anodal: active material is that specific area is 24m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6L is an electrically conductive graphite, and binding agent is Kynoar PVDF761A, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas; The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=88:4:2:6:115; At first PVDF761A is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, mechanical high-speed stirs carried out pre-dispersed in 3 hours; Mixing speed 1800r/min, and then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir mechanical high-speed mixing speed 1600r/min 2.5 hours; Ultrasonic agitation pressure 11MPa, supersonic frequency is 20KHz, slurry is coated with through after the froth in vacuum; Using the thickness of aluminium foil is 20 μ m, through super-dry, and roll-in; Carry out the lug welding after cutting, the number of lug is 4, and width is the aluminium strip of 5mm;
The preparation negative pole: negative electrode active material is artificial graphite C AG-3, and conductive agent is conductive black Super-P, and adhesive is butadiene-styrene rubber (SBR), and thickener is sodium carboxymethylcellulose (CMC), and water is solvent, and the negative pole viscosity Control is 1500 ~ 6000mPas; The ratio of various materials is in the slurry: CAG-3:Super-P:CMC:SBR:H
2O=91:4:1.5:3.5:125; At first that CMC is soluble in water; Add mixed in advance Delanium and conductive agent, high-speed stirred 3 hours, mixing speed 1800r/min again; And then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir 2 hours; High-speed stirred speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Added the SBR high-speed stirred again 2 hours, mixing speed 1500r/min; Slurry is coated with through after the froth in vacuum, and using the thickness of Copper Foil is 15 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 3, and width is the ambrose alloy composite band of 5mm;
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 48h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling; Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 13g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m.
Battery production method of the present invention has the following advantages:
1, the method for utilizing ultrasonic agitation and mechanical agitation to combine has improved the uniformity of cell size, has further improved the consistency of pole piece;
2, when assembling adopted the fail safe that protective atmosphere helps to improve battery, the simple battery of manufacture craft all through 3C/10V overcharge, safety testings such as 150 ℃/30min thermal shock, short circuit, acupuncture;
3, the battery of preparation, its continuous discharge electric current can reach 30C, and the conservation rate of discharge capacity reaches 90% of 1C within 1 ~ 30C;
4, the battery that adopts this method to make has better cycle performance, and the 10C discharge cycles is greater than 500 times.
Description of drawings
Fig. 1 positive plate design shape of the present invention figure.
Fig. 2 is negative plate design shape figure of the present invention.
Fig. 3 is the discharge curve of 18650-1100mAh-3.3V size battery at 10C, 15C, 20C, 30C.
Fig. 4 is the discharge curve of 18650-2300mAh-3.3V size battery at 10C, 20C.
Embodiment
Below in conjunction with specific embodiment the present invention is described further.
The present invention realizes through following technical scheme:
A kind of high magnification ferric phosphate lithium cell and preparation method thereof; Comprise the preparation of anode and cathode slurry, the design of positive/negative plate and the design of battery security; It is the method that combines with ultrasonic agitation and mechanical agitation that the preparation of anode and cathode slurry is adopted, and has improved the slurry dispersion effect; Positive pole is that LiFePO4 active material, conductive agent and binding agent are coated on the aluminium foil after according to certain proportioning slurrying; Negative pole is that graphite (or carbonaceous mesophase spherules, lithium titanate), conductive agent and butadiene-styrene rubber (SBR) are coated on the Copper Foil according to certain proportioning slurrying; Process column type box hat battery, electric core assembles under the atmosphere protection environment, and battery improves its fail safe through the block air releasing device.
Described stirring means carries out the pre-dispersed 1 ~ 6h of high speed for adopting mechanical agitation earlier to slurry; Adopting ultrasonic agitation and mechanical agitation to combine again further disperses pre-dispersed slurry; Improve the even degree of scatter of material, ultrasonic agitation is 1 ~ 6h, and ultrasonic pressure is 5 ~ 20MPa; Supersonic frequency is 15 ~ 60KHz, and ultrasonic rotating speed is 120 ~ 2200r/min.
Specific area＜the 30m of LiFePO 4 material in the described positive pole
2/ g, conductive agent are Super P-Li carbon black (or KS is serial, SFG series, CNT, carbon nano-fiber), and binding agent is a PVDF series.Anodal proportioning is: LiFePO4 70 ~ 93%, conductive agent are 1 ~ 20%, and binding agent PVDF is 2 ~ 15%.The negative pole proportioning is: graphite 85 ~ 95%, conductive agent are 1 ~ 10%, and SBR is 2 ~ 8%.
Described aluminum foil thickness is 15 ~ 25 μ m, and copper thickness is 10 ~ 20 μ m; Positive pole ear is an aluminium strip, and width is between 3 ~ 25mm; Negative lug is nickel strap or copper nickel composite band, and width is 3 ~ 25 μ m.
Protective atmosphere when described electric core assembles is nitrogen or argon gas, and the popping pressure of block is 1.0 ~ 5.0mPa.
Described positive/negative plate lug adopts multipole ear mode, lug number >=2.
Described battery diaphragm is three layers of composite diaphragm of PP/PE/PP or PE single-layer septum, and the thickness of barrier film is 15 ~ 30 μ m.
Described electrolyte is lithium hexafluoro phosphate (LiPF
6) with ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate organic solution in two or more mixture.
Described battery is the cylindrical steel housing battery, and main model has 18650,22650,26650 etc.
Manufacturing process with 18650-1100mAh-3.3V and 26650-2300mAh-3.3V high-multiplying-power battery is that example is explained below, and the battery profile is as shown in Figure 1, and the manufacture method instance of battery is following:
Preparation is anodal: active material is that specific area is 25m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6 is an electrically conductive graphite, and binding agent is Kynoar PVDF5130, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas.The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=89:4:2:5:115.At first PVDF5130 is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, mechanical high-speed stirs carried out pre-dispersed (1800r/min) in 3 hours; And then adopt mechanical high-speed to stir the method that (1500r/min) and ultrasonic agitation (pressure 10MPa, supersonic frequency is 20KHz) combine and stirred 3 hours, slurry is coated with after passing through froth in vacuum; Using the thickness of aluminium foil is 20 μ m, through super-dry, and roll-in; Carry out the lug welding after cutting; The number of lug is 4, and width is the aluminium strip of 5mm, and the shape of making pole piece is as shown in Figure 2.
The preparation negative pole: negative electrode active material is artificial graphite C AG-3, and conductive agent is conductive black Super-P, and adhesive is butadiene-styrene rubber (SBR), and thickener is sodium carboxymethylcellulose (CMC), and water is solvent, and the negative pole viscosity Control is 1500 ~ 6000mPas.The ratio of various materials is in the slurry: CAG-3:Super-P:CMC:SBR:H
2O=91:4:1.5:3.5:125.At first that CMC is soluble in water, add mixed in advance Delanium and conductive agent, high-speed stirred 3 hours (1800r/min) again; And then adopt mechanical high-speed to stir the method stirring 2 hours that (1500r/min) and ultrasonic agitation (pressure 10MPa, supersonic frequency is 20KHz) combine, add SBR high-speed stirred 2 hours (1500r/min) again; Slurry is coated with through after the froth in vacuum, and using the thickness of Copper Foil is 15 μ m, through super-dry; The lug welding is carried out in roll-in after cutting, the number of lug is 3; Width is the ambrose alloy composite band of 5mm, and the shape of making pole piece is as shown in Figure 2.
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 30h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling.Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 6g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m.Employing has the block of air releasing device, and popping pressure is 1.8 ~ 2.3MPa.
The battery size of making is 18650-1100mAh-3.3V, and its performance is as shown in Figure 3, and the 30C discharge capacity reaches 95% of rated capacity, has good high rate capability.
Preparation is anodal: active material is that specific area is 24m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6L is an electrically conductive graphite, and binding agent is Kynoar PVDF761A, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas.The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=88:4:2:6:115.At first PVDF761A is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, mechanical high-speed stirs carried out pre-dispersed (1800r/min) in 3 hours; And then adopt mechanical high-speed to stir the method that (1600r/min) and ultrasonic agitation (pressure 11MPa, supersonic frequency is 20KHz) combine and stirred 2.5 hours, slurry is coated with after passing through froth in vacuum; Using the thickness of aluminium foil is 20 μ m, through super-dry, and roll-in; Carry out the lug welding after cutting; The number of lug is 4, and width is the aluminium strip of 5mm, and the shape of making pole piece is as shown in Figure 2.
Preparation negative pole: with consistent in the instance 1.
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 48h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling.Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 13g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m.
The battery size of making is 26650-2300mAh-3.3V, and its performance is as shown in Figure 4, and its 20C discharge capacity reaches 95% of rated capacity.
Claims (9)
1. a high magnification ferric phosphate lithium cell comprises positive pole and negative pole, and positive pole is that LiFePO4 active material, conductive agent and binding agent are coated on the aluminium foil after according to proportioning slurrying; Negative pole is that graphite, conductive agent and binding agent are coated on the Copper Foil according to proportioning slurrying; Process column type box hat battery, it is characterized in that: the specific area＜30m of LiFePO 4 material in the anode sizing agent
2/ g, conductive agent are that conductive black (Super P-Li) or KS series, SFG are serial, CNT, carbon nano-fiber, and binding agent is Kynoar (PVDF) series, and its weight proportion is: active compound lithium iron phosphate 70 ~ 93%; Conductive agent is 1 ~ 20%; Binding agent is 2 ~ 15%; The cathode size proportioning is: active material graphite or carbonaceous mesophase spherules or lithium titanate 85 ~ 95%, conductive agent are that conductive black (Super P-Li) or KS series, SFG are serial, CNT, carbon nano-fiber, and the conductive agent percentage by weight is: 1 ~ 10%; Binding agent is butadiene-styrene rubber (SBR), and weight of binder percentage is 2 ~ 8%; It is to combine with ultrasonic agitation and mechanical agitation to improve the slurry degree of scatter that the preparation of affiliated anode sizing agent and cathode size is adopted; The electricity core assembles under the atmosphere protection environment, and the block of battery is provided with air releasing device.
2. a kind of high magnification ferric phosphate lithium cell according to claim 1; It is characterized in that: stir and adopt mechanical agitation that slurry is carried out the pre-dispersed 1 ~ 6h of high speed earlier, adopt ultrasonic agitation and mechanical agitation to combine again pre-dispersed slurry is further disperseed, improve the even degree of scatter of material; Ultrasonic agitation is 1 ~ 6h; Ultrasonic pressure is 5 ~ 20MPa, supersonic frequency 15 ~ 60KHz, and mixing speed is 120 ~ 2200r/min.
3. a kind of high magnification ferric phosphate lithium cell according to claim 1 is characterized in that: described positive/negative plate lug adopts multipole ear mode, lug number >=2.
4. a kind of high magnification ferric phosphate lithium cell according to claim 1 is characterized in that: described aluminum foil thickness is 15 ~ 25 μ m, and copper thickness is 10 ~ 20 μ m; Positive pole ear is an aluminium strip, and width is between 3 ~ 25mm; Negative lug is nickel strap or copper nickel composite band, and width is 3 ~ 25 μ m.
5. a kind of high magnification ferric phosphate lithium cell according to claim 1 is characterized in that: the protective atmosphere when electric core assembles is nitrogen or argon gas, and the popping pressure of block is 1.0 ~ 5.0MPa.
6. a kind of high magnification ferric phosphate lithium cell according to claim 1 is characterized in that: battery diaphragm is three layers of composite diaphragm of PP/PE/PP or PE single-layer septum, and the thickness of barrier film is 15 ~ 30 μ m; Electrolyte is lithium hexafluoro phosphate (LiPF
6) with ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate organic solution in two or more mixture.
7. method for preparing claim 1,2,3,4,5 or 6 said high magnification ferric phosphate lithium cells, it is characterized in that: it is the method that combines with ultrasonic agitation and mechanical agitation that the preparation of positive and negative electrode slurry is adopted, and has improved the slurry dispersion effect; Positive pole is that LiFePO4 active material, conductive agent and binding agent are coated on the aluminium foil after according to said proportioning slurrying; Negative pole is that graphite or carbonaceous mesophase spherules, lithium titanate, conductive agent and butadiene-styrene rubber (SBR) are coated on the Copper Foil according to said proportioning slurrying; Process column type box hat battery, electric core assembles under the atmosphere protection environment, and battery improves its fail safe through the block air releasing device.
8. according to the preparation method of the said high magnification ferric phosphate lithium cell of claim 7, it is characterized in that: preparation is anodal: active material is that specific area is 25m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6 is an electrically conductive graphite, and binding agent is Kynoar PVDF5130, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas; The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=89:4:2:5:115; At first PVDF5130 is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, the mechanical high-speed stirring was carried out pre-dispersed in 3 hours, mixing speed 1800r/min; Adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir then 3 hours, mechanical high-speed mixing speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Slurry is coated with through after the froth in vacuum, and using the thickness of aluminium foil is 20 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 4, and width is the aluminium strip of 5mm; The preparation negative pole: negative electrode active material is artificial graphite C AG-3, and conductive agent is conductive black Super-P, and adhesive is butadiene-styrene rubber (SBR), and thickener is sodium carboxymethylcellulose (CMC), and water is solvent, and the negative pole viscosity Control is 1500 ~ 6000mPas; The ratio of various materials is in the slurry: CAG-3:Super-P:CMC:SBR:H
2O=91:4:1.5:3.5:125; At first that CMC is soluble in water; Add mixed in advance Delanium and conductive agent, high-speed stirred 3 hours, mixing speed 1800r/min again; And then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir 2 hours; High-speed stirred speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Added the SBR high-speed stirred again 2 hours, mixing speed 1500r/min; Slurry is coated with through after the froth in vacuum, and using the thickness of Copper Foil is 15 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 3, and width is the ambrose alloy composite band of 5mm;
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 30h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling; Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 6g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m; Employing has the block of air releasing device, and popping pressure is 1.8 ~ 2.3MPa.
9. according to the preparation method of the said a kind of high magnification ferric phosphate lithium cell of claim 7, it is characterized in that: preparation is anodal: active material is that specific area is 24m
2The LiFePO4 of/g, conductive agent are conductive black Super-P, and KS-6L is an electrically conductive graphite, and binding agent is Kynoar PVDF761A, and n-formyl sarcolysine base pyrrolidines (NMP) is a solvent, and the anode sizing agent viscosity Control is 3000 ~ 15000mPas; The percentage of various materials is in the slurry: LiFePO
4: Super-P:KS-6:PVDF5130:NMP=88:4:2:6:115; At first PVDF761A is dissolved among the NMP, adds LiFePO4 and electrically conductive graphite and the conductive black that is pre-mixed again, mechanical high-speed stirs carried out pre-dispersed in 3 hours; Mixing speed 1800r/min, and then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir mechanical high-speed mixing speed 1600r/min 2.5 hours; Ultrasonic agitation pressure 11MPa, supersonic frequency is 20KHz, slurry is coated with through after the froth in vacuum; Using the thickness of aluminium foil is 20 μ m, through super-dry, and roll-in; Carry out the lug welding after cutting, the number of lug is 4, and width is the aluminium strip of 5mm; The preparation negative pole: negative electrode active material is artificial graphite C AG-3, and conductive agent is conductive black Super-P, and adhesive is butadiene-styrene rubber (SBR), and thickener is sodium carboxymethylcellulose (CMC), and water is solvent, and the negative pole viscosity Control is 1500 ~ 6000mPas; The ratio of various materials is in the slurry: CAG-3:Super-P:CMC:SBR:H
2O=91:4:1.5:3.5:125; At first that CMC is soluble in water; Add mixed in advance Delanium and conductive agent, high-speed stirred 3 hours, mixing speed 1800r/min again; And then adopt the method that mechanical high-speed stirs and ultrasonic agitation combines to stir 2 hours; High-speed stirred speed 1500r/min, ultrasonic agitation pressure 10MPa, supersonic frequency is 20KHz; Added the SBR high-speed stirred again 2 hours, mixing speed 1500r/min; Slurry is coated with through after the froth in vacuum, and using the thickness of Copper Foil is 15 μ m, and through super-dry, the lug welding is carried out in roll-in after cutting, and the number of lug is 3, and width is the ambrose alloy composite band of 5mm;
After positive/negative plate carried out, middlely be wound into required model electricity core, reenter shell then and toast 48h, carry out fluid injection, assembling, change into, partial volume for barrier film adopts the mode of reeling; Wherein Buchholz protection is adopted in assembling, and gas is nitrogen or argon gas; Electrolyte adopts the LiPF of 1mol/L
6The solution of organic system, addition are 13g; Barrier film adopts three layers of composite diaphragm of PP/PE/PP, and thickness is 20 μ m.
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